Hi, I'm running fsck on an external USB hard drive, using OpenBSD 6.2 inside VirtualBox on MacOS.
On each run it gives a handful of "CANNOT READ: BLK ..." messages, but the block numbers reported are different (!) each time. If the disk is damaged, shouldn't the problematic blocks be consistent? Does this point to a communication problem with the disk (e.g. faulty USB cable)? Or is this a hopelessly unstable situation given the general screwiness of USB over VirtualBox/Mac OS...? Also, does answering "y" to "CANNOT READ" modify the disk contents? Thanks for any insights! Max xhci0 at pci0 dev 12 function 0 "Intel 7 Series xHCI" rev 0x00: apic 2 int 20 usb0 at xhci0: USB revision 3.0 uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1 umass0 at uhub0 port 9 configuration 1 interface 0 "Seagate Expansion" rev 3.00/0.00 addr 2 umass0: using SCSI over Bulk-Only scsibus4 at umass0: 2 targets, initiator 0 sd0 at scsibus4 targ 1 lun 0: <Seagate, Expansion, 9300> SCSI4 0/direct fixed sd0: 3815447MB, 512 bytes/sector, 7814037167 sectors $ doas fsck /dev/sd0a ** /dev/rsd0a ** Last Mounted on /home/max/mnt ** Phase 1 - Check Blocks and Sizes CANNOT READ: BLK 4235468160 CONTINUE? [Fyn?] y THE FOLLOWING DISK SECTORS COULD NOT BE READ: CANNOT READ: BLK 4128081280 CONTINUE? [Fyn?] y THE FOLLOWING DISK SECTORS COULD NOT BE READ: CANNOT READ: BLK 4194986880 CONTINUE? [Fyn?] y CONTINUE? [Fyn?] y THE FOLLOWING DISK SECTORS COULD NOT BE READ: ** Phase 2 - Check Pathnames CANNOT READ: BLK 4195146384 CONTINUE? [Fyn?] y CONTINUE? [Fyn?] y THE FOLLOWING DISK SECTORS COULD NOT BE READ: ** Phase 3 - Check Connectivity ** Phase 4 - Check Reference Counts ** Phase 5 - Check Cyl groups 614222 files, 408012667 used, 76524122 free (3658 frags, 9565058 blocks, 0.0% fragmentation) MARK FILE SYSTEM CLEAN? [Fyn?] y ***** FILE SYSTEM WAS MODIFIED ***** $ doas fsck -f /dev/sd0a ** /dev/rsd0a ** File system is already clean ** Last Mounted on /home/max/mnt ** Phase 1 - Check Blocks and Sizes CANNOT READ: BLK 4236615424 CONTINUE? [Fyn?] y THE FOLLOWING DISK SECTORS COULD NOT BE READ: ** Phase 2 - Check Pathnames CANNOT READ: BLK 3732315520 CONTINUE? [Fyn?] y THE FOLLOWING DISK SECTORS COULD NOT BE READ: CANNOT READ: BLK 4161885792 CONTINUE? [Fyn?] y THE FOLLOWING DISK SECTORS COULD NOT BE READ: CANNOT READ: BLK 4201995728 CONTINUE? [Fyn?] y THE FOLLOWING DISK SECTORS COULD NOT BE READ: CANNOT READ: BLK 4202008160 CONTINUE? [Fyn?] y THE FOLLOWING DISK SECTORS COULD NOT BE READ: CANNOT READ: BLK 4202013680 CONTINUE? [Fyn?] y THE FOLLOWING DISK SECTORS COULD NOT BE READ: ** Phase 3 - Check Connectivity ** Phase 4 - Check Reference Counts ** Phase 5 - Check Cyl groups CANNOT READ: BLK 5011229824 CONTINUE? [Fyn?] y THE FOLLOWING DISK SECTORS COULD NOT BE READ: 614222 files, 408012667 used, 76524122 free (3658 frags, 9565058 blocks, 0.0% fragmentation)
